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European Occupational Health Series : World Health Organization : Report on a European Syposium Convened by the Regional Office for Europe D4 63 2: Directory of Official Drug Control Agencies in the European Region

Excerpt
Course of the Epidemic
In Japan, an influenza epidemic pre\-ailed in the winter of 1956-57.
This epidemic was found to be due to the viruses of both A (AINetherlands156
type, according to Dr. A. Isaacs and B types. In the Tokyo area
the number of schools affected by the -4-type virus was not very different
from that of the schools affected by the B-type virus, as far as can be
estimated from the results of \%us isolations and serological diagnoses ;
There were also some schools where cases due to A and B viruses were
found at the same time in one and the same outbreak. The epidemic,
whch had started at about the end of NOT-ember 1956, had almost subsided
by the end of the year in the Tokj-o area, but seems to have lasted until
March 1957 in some of the rural areas.